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* cosmo.el (cosmo--trapzd, cosmo-qsimp): Check Simpson's rule for
convergence and stop if the desired accuracy is reached. The
previous algorithm did't perform any convergence check. At low
redshift z~1 numerical integrals are now about one order of
magnitude faster, at large redshift z~1 one order of magnitude
slower (but it is guaranteed to reach the desired accuracy).
* cosmo.el (cosmo, cosmo-int-prec, cosmo-int-maxsteps): Define
customization group to allow users to set numerical integrals
precision variable through the `customize' command.
* README.org: Explain how to customize variables.